bash.sh

script1.sh

#!/bin/bash

name1="test1"
export name2="test2"
{ typeset name3="test3"} #This is a local variable. It cannot be accessed outside the braces.

(echo $name1) #This is executed in a sub-shell. Hence prints 'name1'
(echo $name2) #This is executed in a sub-shell. Hence prints 'name2'
(echo $name3) #This is executed in a sub=shell. It does not have access to the local variable 'name3'

./script2.sh #script2.sh is executed as a sub-process. Can only print 'name2'
. script2.sh #script2.sh is sourced into the current script. Can print name1, name2
source script2.sh #script2.sh is sourced into the current script. Can print name1, name2